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BULLETIN OF THE UNITED STATES FISH COMMISSION. 
kuow of no better identification, however, and in this case nothing will be gained by 
the exchange of one doubtful opiuiou for another. This is certainly a distinct species 
and it must have been known to Poey. 
51. MYCTEROPERCA DIMIDIATA. 
Serranus dimidiatus Poey, Memorias Cuba, 1860, II, 129 (Cuba). 
Trisotropis dimidiatus Poey, Syn. Pise. Cubens., 1868, 285; Poey, Ann. Lyc. Nat. Hist. N. Y., 1869, 308; 
Poey, Enum. Pise. Cubens., 1875, 14, II, 129, 1860 (Cuba). 
Mycteroperoa dimidiata Jordan & Swain, 1. c., 367 (eopied). 
Habitat. — West Indian fauna, Cuba. 
Etymology. — Dimidiatus.! halved, upper half of body differing in coloration from 
lower. 
We find a small specimen of this species (26953, M. C. Z., 8 inches long) in the 
museum at Cambridge. It was sent from Havana by Professor Poey, and it is proba- 
bly one of his types. 
Body rather deep and compressed; mouth small, lower jaw projecting; canines 
strong, as in M. falcata-, snout rather sharp, 4 in head; maxillary 2; eye 5; nostrils 
small, not far apart, the anterior rather the larger ; angle of preopercle salient, armed 
with stronger teeth; gill-rakers rather slender, x + 14. Scales rather small, about 
110; caudal fin rather deeply lunate ; anal fin rounded. 
Head 3 in length ; depth 3. D. XI, 16 ; A. Ill, 11. ' 
Color, in spirits, quite dark above, the lower half abruptly paler ; a narrow pale 
ring around caudal peduncle, behind which is a squarish dark blotch, smaller than 
eye, at base of upper rays of caudal ; a dark area from tip of lower jaw through eye to 
the boundary between the dark and pale on the sides. Caudal, soft dorsal, ventrals, 
and anal edged with black. 
52. MYCTEROPERCA XENARCHA. 
Mycteroperoa xenarcha Jordan, Proc. Ac. Nat. Sci Phila., 1887 (Galapagos Islands; Payta). 
Habitat. — Galapagos Archipelago ; Coast of Peru. 
Etymology. — Eei^d?, strange ; anus. 
This species is known from numerous specimens in the Museum of Comparative 
Zoology at Cambridge, from the Galapagos Islands and from Payta, Peru. 
53. MYCTEROPERCA RUBRA. 
Epinephelus ruber Bloch, Icbthyologia, vii, 22, 1793, Tafel 330 (“Japan” (?) ); Bloch «&, Schneider, Sys- 
tema Ichthyol., 1801, 299 (copied). 
Serranus ruber Peters, Berliner Monatsberichte, 1865, 107 (re-description of original type). 
? ? Sparus scirenga Rafinesque, Caratteri di alcuni Nuovi Generi etc., 50, 1810 (Palermo ; as likely to be 
Epinepbelus alexandrinus). 
Mycteroperoa scirenga Jordan & Swain, 7. c., 369 (copied). 
Serranus acutirostris OnY. & Val., II, 286, 1828 (Brazil) ; Valenciennes, “ Ichthyologie des lies Cana- 
ries, pi. iii, f. 1” (Canary Islands; Messina) ; Gnichenot, Explor. Sci. Algdrie, Zool., v, 35, 1850 
(Algiers); Gunther, I, 135, 1859; Steindachner, Ichth. Beitr., xii, 5, 1882 (identified with .S. 
undulosus). 
Parepinephelus acutirostris Bleeker. 
